在实际企业环境中，大型机应用程序帧听的队列可能已经存在。
In a real enterprise, the queue that the mainframe application listens on would probably already exist.
此操作将记录消息，然后将消息同时转发给两个导入，即mdb帧听的jms队列和您在前面定义的mq队列。
This will lead to the message being logged, and then forwarded to both imports, namely the JMS queue that the MDB listens to, and the MQ queue you defined earlier.
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